Ran into a couple of issues.

The way it is now, it does delete the stock .wma rings. The problem is they are marked as ROM files, so they are automatically re-created once they are deleted.

Not a huge issue, they don't take up much space.

Second issue, this one is pretty big - the .wav ring replacements supplied earlier in the thread are pretty low quality. This will be an easy fix, I'll just re-encode them. It's just going to take some more time.

The registry tweak to switch to the .wav ringers worked just fine. Since the old .wma ringers can not be deleted, the new ringers will follow the same standard set before, they will have a space between "Ring" and the name, instead of a dash. I'll edit this post with the files when I re-encode the .wav files and upload it.